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Start ShoppingCometic C7147 High Performance Top End Gasket Kit - MLS Head Gasket for Racing & High-Load Engines
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Description
Upgrade your engine's reliability and performance with Cometic's C7147 High Performance Top End Gasket Kit. Designed for racing and high-load applications, this comprehensive kit delivers exceptional sealing and durability for stock or mildly modified engines.
Key Features
- MLS Head Gasket Technology: Multi-layer steel construction provides superior sealing under extreme temperatures and pressures.
- Complete Top End Coverage: Includes cylinder head gasket, base/cylinder gasket, exhaust gaskets, valve stem seals, and specialized O-rings for full engine compatibility.
- High-Density Materials: Durable fiber and coated materials ensure long-lasting performance in high-performance environments.
- US Manufacturing: Made in the USA with precision engineering for consistent quality and reliability.
Why Choose This Product
Cometic's C7147 kit is engineered for racers and performance enthusiasts who demand uncompromising sealing and durability. The combination of MLS head gaskets and reinforced materials handles high RPMs, boost pressure, and thermal stress while maintaining compatibility with stock and modified engines. This kit eliminates the need for multiple purchases, saving time and ensuring perfect fitment for your application.
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Upgrade your engine's reliability and performance with Cometic's C7147 High Performance Top End Gasket Kit. Designed for racing and high-load applications, this comprehensive kit delivers exceptional sealing and durability for stock or mildly modified engines.
Key Features
- MLS Head Gasket Technology: Multi-layer steel construction provides superior sealing under extreme temperatures and pressures.
- Complete Top End Coverage: Includes cylinder head gasket, base/cylinder gasket, exhaust gaskets, valve stem seals, and specialized O-rings for full engine compatibility.
- High-Density Materials: Durable fiber and coated materials ensure long-lasting performance in high-performance environments.
- US Manufacturing: Made in the USA with precision engineering for consistent quality and reliability.
Why Choose This Product
Cometic's C7147 kit is engineered for racers and performance enthusiasts who demand uncompromising sealing and durability. The combination of MLS head gaskets and reinforced materials handles high RPMs, boost pressure, and thermal stress while maintaining compatibility with stock and modified engines. This kit eliminates the need for multiple purchases, saving time and ensuring perfect fitment for your application.| SKU | GMC57B43F9 |
|---|---|
| MPN | C7147 |
| UPC/GTIN | 191070041526 |
| Brand | Cometic |
| Category | Gaskets/Seals |
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Frequently Asked Questions
It is designed as a top‑end kit and typically includes the head gasket, base gasket, exhaust gaskets, and key O‑rings or valve stem seals for that engine. It does not replace a full engine gasket set, so bottom‑end gaskets and seals are not included.
Cometic’s High Performance top‑end kits usually feature an MLS head gasket where the engine design allows it. The exact construction for C7147 depends on the specific engine it fits; check Cometic’s catalog or tech sheet for this part number to confirm the layer count and material.
Many builders use Cometic high‑performance head gaskets on mildly modified engines, but you must verify bore size and thickness requirements against your piston and cylinder setup. Using the wrong bore or thickness can cause sealing issues or alter compression more than intended.
In most applications, MLS head gaskets are installed dry on clean, flat surfaces. Some ancillary paper/fiber gaskets may benefit from a light spray sealant if recommended by your engine builder, but you should follow Cometic’s specific instructions and the OEM service manual.
Cometic performance kits are generally designed to handle higher cylinder pressures and temperatures than typical OEM gaskets, with improved sealing under racing or high‑load use. For a completely stock, casual‑use engine, either OEM or Cometic can work, but performance builders often prefer Cometic for durability and consistency.
Installation Guide
Difficulty
Medium
Est. Time
2 hr 0 min
Tools Required
- Metric or SAE socket set (per vehicle)
- Torque wrench (capable of cylinder head torque spec)
- Combination wrenches
- Feeler gauges (for valve clearance where applicable)
- Plastic or brass scraper / razor blade for gasket removal
- Engine assembly lube (if installing new top-end components)
- Shop rags and brake cleaner/solvent
- Service manual for torque specs and sequence
Pro Tips
- Always follow OEM service manual for torque values and tightening sequence for the head and cylinder.
- Dry fit the head gasket first to confirm orientation and alignment with oil and coolant passages.
- Use a straightedge and feeler gauges to verify head and cylinder deck flatness; resurface if out of spec.
- Avoid using RTV on MLS head gaskets unless specifically called for by Cometic or the OEM.
- After initial heat cycle, some builders recommend re‑torquing the head (only if allowed by the OEM procedure).
Common Mistakes to Avoid
- Not cleaning gasket surfaces completely (leads to sealing issues)
- Reusing old head bolts or studs where new/torque‑to‑yield fasteners are required
- Ignoring factory torque sequence for the cylinder head
- Installing head gasket upside down or misaligned on dowel pins
- Not checking cylinder/head flatness before reassembly
- Dry starting engine without priming oil after top‑end work
Comparison vs Stock/OEM
Cometic’s High Performance top‑end kits are generally engineered to exceed OEM sealing performance, especially under high cylinder pressures and elevated operating temperatures.
Improvements
- Improved sealing under racing or high‑load conditions compared to many OEM composite gaskets
- MLS construction (where used) resists fretting and micro‑leaks better than many stock designs
- Tighter manufacturing tolerances and consistent thickness for predictable compression ratio
- Better resistance to detonation and warping when surfaces are prepared correctly
Considerations
- Requires very clean and flat mating surfaces; more sensitive to poor preparation than some OEM composite gaskets
- Not typically reusable—should be replaced any time the head is removed
- For purely casual, low‑load use, the performance advantage over OEM may not be noticeable
Durability & Warranty
Expected Lifespan
Comparable to or better than OEM head gaskets when installed correctly on flat surfaces and used within design limits; often chosen for race engines that see frequent teardowns.
Warranty
Cometic typically offers a limited manufacturer warranty against defects in materials and workmanship; terms are normally contingent on proper installation and normal use.
Maintenance
No direct maintenance on the gasket itself; monitor for coolant or oil leaks, and follow engine manufacturer’s service intervals for top‑end inspection and rebuilds.
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